Key telephone system wideband conferencing arrangement

ABSTRACT

WIDEBAND CONFERENCING SERVICE BETWEEN STATIONS SERVED BY A KEY TELEPHONE SYSTEM INTERCOM LINK IS PROVIDED BY A CONFERENCE CONTROL CIRCUIT ARRANGED TO MONITOR THE AUDIO TRANMISSION FROM EACH STATION ON A CONFERENCE AND TO TRANSMIT WIDEBAND SIGNALS FROM A CURRENTLY AUDIOACTIVE STATION TO ALL OTHER STATIONS INCLUDED IN THE CONFERENCE. WIDEBAND TRANSMISSION FROM ALL OTHER CONFERENCE STATIONS EXCEPT FROM THE LAST AUDIOACTIVE STATION IS INHIBITED WHILE THE WIDEBAND TRANSMISSION FROM THE LAST AUDIOACTIVE STATION IS TRANSMITTED TO THE CURRENTLY AUDIOACTIVE STATION. IN SITUATIONS WERE TWO STATIONS ALTERNATIVELY BECOME AUDIOACTIVE, PROVISION IS MADE TO ENSURE CONTINUOUS UNINTERRUPTED BIDIRECTIONAL WIDEBAND TRANSMISSION BETWEEN THOSE STATIONS.   D R A W I N G

Filed Aug. 5, 1971 Feb. 27, 1973 R. D. REESE 3,718,770

KEY TELEPHONE SYSTEM WIDEBAND CONFERENCING ARRANGEMENT 52 Sheets-Sheet I A INITIATES A CONFERENCE WITH B,C,AND D. SECOND AMPLIFIER NOT YET USED.

A B B BEGTNS TO SPEAKC AND D,WHO 2 WERE LISTENERS,AND A WHO WAS B 2 C ORIGINATOR,ARE SWITCHED TO AMR 2.

PC C I A NOW C STARTS SPEAKING. A 3 1/ -D AND D ARE LISTENERS AND FOLLOW C'S CAMERA TO AMP I.

C B B TALKS AGAIN. NEITHER THE 4 --c cAMERA NoR THE REcEIvER OF B B 2 A OR I: Is SWITCHED.

B D l I A D BEGINS TO SPEAK D I A A BEGINS TO sPEAR 6 W A 2 I B R. D. REESE 3,718,770

KEY TELEPHONE SYSTEM WIDEBAND CONFERLNCING ARRANGEMENT Feb. 27, 1973 52 Sheets-Sheet :5

Filed Aug. 5, 1971 Em 0M5; I. a

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n T 55a 5% SEE Will. RQEJ 58 $35 h ll Q81? 5 2% E H $2 A T 8-x: Em? R52 E add ARE; $2 52 2055 E R m \a Rbm 8? 8-1 52 R41 5% Jwfi 55% M22: $-31 5E G1 Q25 we; E0 I 8 2E 88 m2: 516 E at -3 N R. D. REESE Feb. 27, 1973 KEY TELEPHONE SYSTEM WIDEBAND CONFERENCING ARRANGEMENT $2 Sheets-Sheet &

t. 3 6E. XE oh w 8m 2.... l 5 a u A d mom m i F 1% E E T8: 65m Ta 2 -I 4; E 251m $-58 :2 Q8; A I} 33% f T 2; hlMlI-III bl I u 1 q g a n 23% 15% Tmm TE h 75 Ill: o 4 5d 22 2-5% -6 m :5 Em E 245% Q? l m; \gm T m Em 87, aid l 25 A 89 IE 5 a2 5:5 5 2 5% 8 2% E2352 ii mo SEE F2 8? is 295m 5 R. D. REESE Feb. 27, 1973 $2 Sheets-Sheet 5 Filed Aug. 5, 1971 2 a; mum xwmo E E 2% 3 m8 3% $55 E3 53% 3E w I I w l T $02; E M28 IE. 22mm 81 E2: a Im Twa TEE i 256m 9E E E? l n 1. $022 u r 3m 4258 wsam 89 3E -21 IQ In. 5 u 9E 2Z2 6? I: i 2% 25 T3 2g mi E u 3 T: Em 89 E I] Ji I32 m2 02 8w! 1 5 v 6t R. D. REESE Feb. 27, 1973 KEY TELEPHONE SYSTEM WIDEBAND CONFERENCING ARRANGEMENT $2 Sheets-Sheet 7 Filed Aug.

243 $52423 BTXZ: $3 $3 $0 025M228 552% 2052 5H EH I m2: QEMZEC STE i QZN E: SQ 225M228 EUEEE 76-92 R. D. REESE Feb. 27, 1973 52 Sheets-Sheet 8 Filed Aug. 5, 1971 x2: 2 m E 6Ez8 5525 20 02 II 81 x2: QZN x8 5528 1524s: 2922 ii... Si 1 um E B J Q E Ix: IE- r I; 35 o; E E

3 h b @E v Q 3: 5 5 NE 5 U2 2: I- 3 x2: 5 in 42:28 5:725 222 i at I R. D. REESE Feb. 27, 1973 a: Sheets-Sheet 9 Filed Aug. 5, 1971 2 -58 W3; 32? Yr Z 8% i :18 35 8 Q 35 -35 S 258% H a 203 3 In; flaw 8 85 28 Em 1. v $5 5% W E V r N K 28 218C 8w Q Em 28 LA 6m Q JAF m5 um/Q 2% 28 m5 JA l um aw "rm/H UH U =1 9: E E5 -U 0E; 03% 05 35 as; a? xz m2 m8 5U afizo u M25528 89 3% 1 m 6Q I I u R. D. REESE Feb. 27, 1973 53 Shuts-Sheet 10 Filed Aug. 5,, 1971 x23 Qmm mom .uu JoEzou muzmmwwzou owe;

x2: azm mom huu 405.200 muzmmmmzou 89 R. D. REESE Feb. 27, 1973 KEY TELEPHONE SYSTEM WIDEBAND CONFERNCING ARRANGEMENT 52 Shoots-Sheet 13 Filed Aug. 5, 1971 R. D. REESE Feb. 27, 1973 KEY TELEPHONE SYSTEM WIDEBAND CONFERENCING ARRANGEMENT 32 SheetS'Sheet 15 Filed Aug. 5, 1971 Nov;

.50 2952b Q2 m mao I :m I M I R. D. REESE Feb. 27, 1973 KEY TELEPHONE SYSTEM WIDEBAND CONFERENCING ARRANGEMENT $2 Sheets-Sheet 16 Filed Aug. 5), 1971 EL r L 12 E9 3m 1 82 E m :5 $2 I: P v '55 5Q 5 22 52 rl 1E 15 TE 72% is 2a: 2; "a; 3 2: :5 F; 20 if: $2 46 fi: 9 Q 5Q 2925 G 50C 6F.

Feb. 27, 1973 R. D. REESE 3,718,770

KEY TELEPHONE SYSTEM WIDEBAND CONFERENCING ARRANGEMENT Flled Aug. 5, 1971 32 Sheets-Sheet l7 SBL FIB-6 "I n. 'I

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R. D. REESE Feb. 27, 1973 KEY TELEPHONE SYSTEM WIDEBAND CONFERENCING ARRANGEHENT 52 Sheets-Sheat 1 a Filed Aug. 5, 1971 SQQ C E V 5 V1 $12 :62 S @I ozwm Ii 95 a: 62 2Q I -52 W 362 7 Q62 5 n S N 12 J 5 Ta w 1 J. 2:: F Z T12 50 301 E l 8% F8 8o: @ZN I 8% I 5U So: 58 W amt 

